On the Origin of Species by Means of Natural Selection: Or The Preservation of Favoured Races in the Struggle for LifeHumphrey Milford, Oxford University Press, 1923 - 454 páginas |
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Página 87
... groups of animals , pair for each birth . Modern re- search has much diminished the number of supposed hermaphrodites , and of real hermaphrodites a large number pair ; that is , two individuals regularly unite for reproduction , which ...
... groups of animals , pair for each birth . Modern re- search has much diminished the number of supposed hermaphrodites , and of real hermaphrodites a large number pair ; that is , two individuals regularly unite for reproduction , which ...
Página 104
... groups more especially adapted to certain stations in their new homes . But the case is very different ; and Alph . De Candolle has well remarked in his great and admirable work , that floras gain by naturalisation , proportionally with ...
... groups more especially adapted to certain stations in their new homes . But the case is very different ; and Alph . De Candolle has well remarked in his great and admirable work , that floras gain by naturalisation , proportionally with ...
Página 105
... groups differing but little from each other , and feebly representing , as Mr. Waterhouse and others have remarked , our carnivorous , ruminant , and rodent mammals , could successfully compete with these well - pronounced orders . In ...
... groups differing but little from each other , and feebly representing , as Mr. Waterhouse and others have remarked , our carnivorous , ruminant , and rodent mammals , could successfully compete with these well - pronounced orders . In ...
Página 112
... groups , moreover , are supposed to have gone on diverging in different directions . The inter- mediate species ... groups descended from these species . But as these two groups have gone on diverging in character from the type of their ...
... groups , moreover , are supposed to have gone on diverging in different directions . The inter- mediate species ... groups descended from these species . But as these two groups have gone on diverging in character from the type of their ...
Página 113
... groups ; and we can understand this fact , for the extinct species lived at very ancient epochs when the branching lines of descent had diverged less . 14 to We shall I see no reason to limit the process of modification , as now ...
... groups ; and we can understand this fact , for the extinct species lived at very ancient epochs when the branching lines of descent had diverged less . 14 to We shall I see no reason to limit the process of modification , as now ...
Otras ediciones - Ver todas
On the Origin of Species by Means of Natural Selection: or the Preservation ... Charles Darwin Vista previa limitada - 2023 |
Términos y frases comunes
accumulated adapted affinities allied species America amount analogous ancient appear Archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common parent continuous crossed crustaceans degree difficulty distinct species divergence doubt embryo endemic Europe existing exterminated extinct extremely facts favourable fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing land larvæ less living male mammals manner Marsupials migration modification modified descendants natural selection naturalists nearly nest oceanic islands offspring organisation perfect pigeons pistil plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary organs seeds sexual selection Silurian slight South America sterility structure struggle successive suppose swimbladder tend theory tion trees variability variation vary whole widely